H. Moser & Cie Endeavour Perpetual Calendar, Operating Instructions Manual

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29
The year and leap year display
The perpetual Flash Calendar used in the ENDEAVOUR
PERPETUAL CALENDAR is based on the Gregorian calendar
in use today. In this system, every 4 years the month of
February is one day longer than the usual 28 days. This is
called a leap year. If the watch is in regular use, you will not
take much notice of this as the calendar will show the right
date even in leap years, just as reliably as it differentiates
months with 30 days from months with 31. If your watch
has not been used for a while, however, the exact year after
the last leap year will also need to be checked and possibly
adjusted when setting the right date. To enable you to do
this, the back of the watch features a leap year indicator
(8) with the numbers 1, 2 and 3, as well as a black field
symbolising the leap year, which can be seen through the
glass back. The display on the leap year indicator repeats
a total of three times.